Pump particularly for pasty media

ABSTRACT

A pump, particularly for pasty media, includes a housing having a suction inlet and a compression discharge passage and an intermediate vacuum exhaust outlet. An outer planetary gear is arranged within the cylindrical space of the housing and a pinion is maintained in engagement with the planetary gear by means of peripherally arranged spaced guide pieces. The rotation of the two gears permits the taking in of the material through the suction and the delivery through the outlet passage. The housing is arranged so that there is a peripheral portion between the suction and the outlet which provides an outer guide for the planetary gear and which forms a spacing between the inlet and outlet which is at least equal to the width of the space between the teeth of the planetary gear. In addition, there is a similar housing portion defined between the outlet and the vacuum exhaust outlet.

United States Patent Inventor Appl. No. Filed Patented Priority PUMPPARTICULARLY FOR PAST Y MEDlA 1.902.315 3/1933 Vogt 103/126 (A)2.159.720 5/1950 Wahlmarki 103/l26tA) 2.630.759 3/l953 Mahlon 103/126(A) Primary Examiner-Carlton R. Croyle Assistant Examiner-Wilbur J.Goodlin Altomey-McGlew and Toren ABSTRACT: A pump. particularly forpasty media. includes a housing having a suction inlet and a compressiondischarge passage and an intermediate vacuum exhaust outlet. An outer 11Cu 1 Dn'l" pm planetary gear is arranged within the cylindrical space ofthe housing and a pinion is maintained in engagement with the US. Cl.418/169. planar Be by f pcriphcrany arrangcd spaccd 418/2 418/74 guidepieces. The rotation of the two gears permits the taking Int. Cl l-Olc1/10 in of he mactia] mmugh he suction and the delivery hrough Field 01Search 91/68; the outlet passage The housing is arranged so that thcrcis a peripheral portion between the suction and the outlet whichprovides an outer guide for the planetary gear and which Rama cued formsa spacing between the inlet and outlet which is at least UNn-ED STATESPATENTS equal to the width of the space between the teeth of theplanel.604.802 10/1926 Brenzinger 103/126 (A) tary gear. in addition.there is a similar housing portion 9/1930 Moessinger 230/152 definedbetween the outlet and the vacuum exhaust outlet.

.1 l5 l T r" 3 s O O a i 4* 4! 29 2s r: 31"\" 2 PATENTEU JUL 1 319mSHEET 1 BF 2 PUMP PARTICULARLY FOR PASTY MEDIA SUMMARY OF THE INVENTIONThis invention relates to the construction of pumps and in particular toa new and useful pump particularly for pasty media having a rotatingplanetary wheel and a pinion with teeth in meshing engagement with theteeth of the planetary wheel and which includes housing wall portions,defining a peripheral spacing around the planetary wheel of a sizecomparable to at least the spacing of the gap between the gear teeth,and located between the suction and the compression outlet and thecompression outlet and the vacuum outlet.

With pumps of the type with which the present invention is concerned itis considered to be disadvantageous to provide a great spacing betweenthe suction inlet and the compression outlet. In some instances thespacing is offset almost over the entire circumference of the pumpinggears. The result of this construction is that the material to bedelivered is not treated very gently during the pumping operation.

In order to improve this situation it is proposed according to theinvention to provide a relatively slight spacing between the suctionduct inlet and the compression outlet, and, in respect to the directionof rotation of the planetary gears, the spacing of the interrupting wallcorresponds substantially to the tooth gap width of the larger planetarywheel. In addition the vacuum exhaust is spaced beyond the compressionexhaust by a similar spacing arrangement of a housing wall. The path tobe travelled by the material is thus reduced to a minimum and for thisreason the material is delivered substantially without being broken upor otherwise damaged during pumping.

If a pump is arranged so that its planetary wheel and meshing gearrotate about horizontal axes the inlet and the outlet will be arrangedin the upper region of the pump housing. The material which passesthrough the gap between the planetary gear and the pinion gear fallsdirectly into the teeth of the planetary wheel and is immediatelytransported up again, that is admixed to the fresh material. The dangerof its being sucked off by the vacuum system is thus greatly reduced.

In a preferred arrangement of the invention a vacuum exhaust outlet islocated at a distance corresponding approximately to the tooth gap widthof the planetary wheel ahead of the compression duct outlet. Thisprovides a technically attainable minimum distance for the pathofmovement of the material. The vacuum exhaust outlet is formed as apocket in the pump housing which communicates with a duct. It thusencompasses a very large region within the housing. In one arrangementthe duct provides a chamberlike enlargement having an inspection windowwhich permits constant observation when the pump is running.

The pinion gear runs inside the planetary gear in an eccentric positionrelatively thereto which is maintained by a guide piece of two-partconstruction with at least one of the parts being removable. In thismanner the arrangement of the gears can be adapted to the material to beconveyed. For coarse material a large guide piece is employed betweenthe pump gears and for fine material a very small one approaching zerowill be selected. The change of spacing can be achieved by using guidepieces of proportionate sizes, for example, a half size etc.Alternatively the guide piece may be mounted at a displaced location toprovide the desirable intermeshing en gagement between the pinion andthe planetary gears.

A particularly flat design pump is attained when the planetary gear andpinion meshing therewith and the guide piece are arranged such that thegears rotate about approximately vertical axes. In a preferredarrangement the filling or intake channel for the pump extendsapproximately parallel or inclined in relation to the shafts or axes ofthe pump gear wheels. This means that despite the horizontal design ofthe pump the conveyed material can be supplied from the top, which is ofadvantage in particular for manual charging.

A further feature of the invention is the arrangement of the two partguide pieces which are located between the peripheries of the planetarygear piece and the pinion gear. One part of the guide piece isadvantageously arranged behind the point where the pump material is fedbut ahead of the exhaust opening for the vacuum system and the otherpart is arranged ahead of the feeding point.

Accordingly, it is an object of the invention to provide an improvedpump arrangement, particularly for pasty media which includes a housinghaving a pumping space with a planetary wheel and a pinion in meshingengagement therewith and which includes an inlet suction which is spacedin a circumferential direction in respect to the planetary gear rotationaway from a compression outlet opening by distance which corresponds tothe gap between the teeth of the planetary wheel, and wherein thehousing also defines a vacuum exhaust outlet located beyond thecompression outlet in respect to the direction of rotation of the gearsand separated from the compression outlet by a wall spacing comparableto the gap width between the teeth of the planetary gears.

A further object of the invention is to provide a pump particularly forpumping pasty media which has an inlet arrangement which isadvantageously arranged to receive material in a vertical loadingdirection and which also has an interior pump housing constructionproviding for a minimum pumping distance between the inlet and-thesuction discharge in order to provide a minimum damaging effect on thematerial being pumped.

A further object of the invention is to provide a pump which is simplein design, rugged in construction, and economical to manufacture.

The various features of novelty which characterize the invention arepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of the invention,its operating advantages and specific objects attained by its use,reference should be had to the accompanying drawings and descriptivematter in which there are illustrated and described preferredembodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS pump constructed GENERAL DESCRIPTIONOF THE PREFERRED v EMBODIMENT Referring to the drawings in particularthe invention embodied in FIG. 1 comprises a housing generallydesignated 2 which has a top inlet or suction passage 1 and a sideoutlet or compression duct 4. Material is transpor d from the suctionduct 1 around through the pumping chamber and out through the outlet 4in a direction of the arrow 5 by means of a planetary gear 6 incooperation with a pinion 7 having teeth meshing therewith. Both bears 6and 7 rotate in the direction of the arrow 8. y

In accordance with one feature of the invention, between the pinion 7and the planetary gear 6 there is arranged a sickle-shaped guide piece11 which is made up of two parts, a first part 9 located between theinlet 1 and the compression discharge duct 4 and a second part 10located between the inlet 1 and a vacuum discharge-or passage 28. Theguide piece 11 defines the engagement arrangement between the pinion 7and the planetary gear 6 and itdefines a space 14 between the inlet 1and the gaps 16 between the teeth 12 of the pinion 7. The material whichis picked up by the rotation of the pinion 7 is delivered between thegaps 16 of the planetary gear 13. The material is conveyed in adirection of the inner compression duct outlets 17 to the compressionoutlet 4. Since the teeth of the pinion 7 come into engagement behindthe tip 18 of the part 9 of the guiding piece 11, the material ispressed out of the tooth gaps and transported into the compression duct4.

In respect to both the embodiments of FIGS. 1 and 2 between the inletduct 1 and the outlet duct .17 the corresponding housing provides aperipheral guiding surface presenting a small spacing or distance 20which corresponds to the tooth gap 15. The material is thus conveyed inthe shortest possible path through the pump. The material which passesdownwardly through the gaps 2i and 22, defined between the guide pieceportion 10 and the teeth 6 of the planetary wheel and the teeth 12 ofthe pinion 7, is immediately transported around by the teeth 23 and 24(which are indicated in both embodiments) and admixed to the freshlyadmitted material through the inlet 1.

In accordance with a further feature of the invention a vacuum pocket 26is formed in the housing 2 at a slight spacing 25 from the compressionoutlet duct 17 which leads to the outlet 4. It has a circumferentialouter wall 27 which is connected through a duct 28 to a vacuum exhaustconduit 29 which is connected to an exhaust device (not shown). Anexpansion chamber 30 is defined in the housing between the duct 28 andthe duct 29. The expansion chamber 30 is closed at its exterior by aninspection window 31. This provides a means for readily observingwhether the conveyed material is being drawn in by the vacuum pumpconnection at the duct 29.

In the slightly modified embodiment shown in FIG. 2 the parts aredesignated similarly but with a prime added thereto. The filling of thematerial is in the direction of the arrow? into the suction l and adischarge is out through the compression outlet in a direction of thearrow In this embodiment the suction duct 1' extends substantiallyvertically. The guidepiece 1 l is also designed as a two partarrangement including wedge-shaped part 9' and a multiformed sided partIn contrast to the pump of FIG. 1, which includes the gear wheels 6 and7 rotating about horizontal axes, in the embodiment of FIG. 2 the shaftsof the pump gears 6 and 7 extend in a vertical direction. In otherrespects the embodiments of FIGS. 1 and 2 are similar.

I claim:

1. A pump, particularly for pasty media, comprising a housing defining apumping space, a suction inlet passage, a compression discharge passagespaced peripherally in respect to said pumping space from said inletpassage, and a vacuum passage spaced peripherally from said compressiondischarge passage; a planetary gear rotatable in said pump pumping spaceand having gear teeth defining delivery gaps therebetween, a pinionhaving gear teeth engageable between the teeth of said planetary gear,guide piece means disposed between said planetary gear and said piniongear and peripherally guiding said pinion gear to maintain it inengagement with said planetary gear, said housing peripheral spacingbetween said inlet passage and said compression discharge passage beingin running peripheral engagement with said planetary gear and being ofan extent at least equal to the spacing between the teeth of saidplanetary gear, and an expansion chamber portion formed in saidconnection between said vacuum conduit connection and said pocket.

2. A pump according to claim 1 wherein said vacuum passage is separatedfrom said compression discharge passage by a portion of said housingwhich is in peripheral running engagement with said planetary gear andwhich is of a width corresponding to the gap between teeth of saidplanetary gear.

3. A pump according to claim 1, wherein said vacuum passage comprises anannular portion forming a pocket, a vacuum conduit connection, and aconnecting passage between said conduit connection and said pocket.

4. A pump according to claim 1, wherein said housing includes a viewingwindow at the location of said expansion chamber.

5. A pump according to claim 1, wherein said guide piece means comprisestwo separate guiding parts located at spaced peripheral locationsadjacent said inlet passage.

6. A pump according to claim I, wherein said housing pumping spacepermits said planetary gear and said pinion to rotate about asubstantially vertical axis.

7. A pump according to claim 5, wherein said inlet passage extendssubstantially parallel to the axis of rotation of said pinion gear andsaid planetary gear.

8. A pump according to claim I, wherein said guide piece means comprisesa first part located between said inlet passage and said deliverydischarge passage and a second part located between said inlet passageand said vacuum passage.

9. A pump according to claim 1, wherein said guiding piece meansincludes a first sector-shaped member disposed between said pinion gearteeth and said planetary gear teeth and located between said inletpassage and said compression discharge passage, a second guide piecemember disposed between said planetary gear teeth and said pinion gearteeth 'and located at a spaced location from said inlet passage in adirection toward said vacuum passage.

10. A pump, particularly for handling pasty media, comprising a housingdefining a pumping space a suction inlet passage a compression dischargepassage spaced peripherally in respect to said pumping space from saidinlet passage and a vacuum passage spaced peripherally from saidcompression discharge passage, a planetary gear rotatable is said pumppumping space and having gear teeth defining deliverygaps therebetween,a pinion having gear teeth engageable between the teeth of saidplanetary gear, said pinion defining an ecgentric gap in respect to saidplanetary gear, guide piece means disposed in said eccentric gap andperipherally guiding said pinion gear to maintain it in engagement withsaid planetary gear, and a vacuum connection connected into theperiphery of said pumping space between said inlet and said dischargepassage and having a pump evacuating connecting line for eliminating airfrom said pumping space.

11. A pump, according to claim 10, wherein said pump comprises ahorizontally arranged pump, said planetary gear being rotatable about avertical axis, said inlet extending substantially parallel to the piniongear axis.

1. A pump, particularly for pasty media, comprising a housing defining apumping space, a suction inlet passage, a compression discharge passagespaced peripherally in respect to said pumping space from said inletpassage, and a vacuum passage spaced peripherally from said compressiondischarge passage; a planetary gear rotatable in said pump pumping spaceand having gEar teeth defining delivery gaps therebetween, a pinionhaving gear teeth engageable between the teeth of said planetary gear,guide piece means disposed between said planetary gear and said piniongear and peripherally guiding said pinion gear to maintain it inengagement with said planetary gear, said housing peripheral spacingbetween said inlet passage and said compression discharge passage beingin running peripheral engagement with said planetary gear and being ofan extent at least equal to the spacing between the teeth of saidplanetary gear, and an expansion chamber portion formed in saidconnection between said vacuum conduit connection and said pocket.
 2. Apump according to claim 1 wherein said vacuum passage is separated fromsaid compression discharge passage by a portion of said housing which isin peripheral running engagement with said planetary gear and which isof a width corresponding to the gap between teeth of said planetarygear.
 3. A pump according to claim 1, wherein said vacuum passagecomprises an annular portion forming a pocket, a vacuum conduitconnection, and a connecting passage between said conduit connection andsaid pocket.
 4. A pump according to claim 1, wherein said housingincludes a viewing window at the location of said expansion chamber. 5.A pump according to claim 1, wherein said guide piece means comprisestwo separate guiding parts located at spaced peripheral locationsadjacent said inlet passage.
 6. A pump according to claim 1, whereinsaid housing pumping space permits said planetary gear and said pinionto rotate about a substantially vertical axis.
 7. A pump according toclaim 5, wherein said inlet passage extends substantially parallel tothe axis of rotation of said pinion gear and said planetary gear.
 8. Apump according to claim 1, wherein said guide piece means comprises afirst part located between said inlet passage and said deliverydischarge passage and a second part located between said inlet passageand said vacuum passage.
 9. A pump according to claim 1, wherein saidguiding piece means includes a first sector-shaped member disposedbetween said pinion gear teeth and said planetary gear teeth and locatedbetween said inlet passage and said compression discharge passage, asecond guide piece member disposed between said planetary gear teeth andsaid pinion gear teeth and located at a spaced location from said inletpassage in a direction toward said vacuum passage.
 10. A pump,particularly for handling pasty media, comprising a housing defining apumping space a suction inlet passage a compression discharge passagespaced peripherally in respect to said pumping space from said inletpassage and a vacuum passage spaced peripherally from said compressiondischarge passage, a planetary gear rotatable is said pump pumping spaceand having gear teeth defining delivery gaps therebetween, a pinionhaving gear teeth engageable between the teeth of said planetary gear,said pinion defining an eccentric gap in respect to said planetary gear,guide piece means disposed in said eccentric gap and peripherallyguiding said pinion gear to maintain it in engagement with saidplanetary gear, and a vacuum connection connected into the periphery ofsaid pumping space between said inlet and said discharge passage andhaving a pump evacuating connecting line for eliminating air from saidpumping space.
 11. A pump, according to claim 10, wherein said pumpcomprises a horizontally arranged pump, said planetary gear beingrotatable about a vertical axis, said inlet extending substantiallyparallel to the pinion gear axis.